Three, perhaps even four potentially habitable planets are orbiting a star in a triple-star system some 22 light-years from Earth, a team of astronomers announced Tuesday. It’s the first time researchers have found so many planets orbiting within a…

[Image: Artist’s impression of a trio of super-Earths discovered near the star HD 40307 by an European team using the HARPS spectrograph on ESO’s 3.6-m telescope at La Silla, Chile. Via Wikipedia Commons.]